Unanswered: working flow of mvc in extjs4.1

Unanswered: working flow of mvc in extjs4.1

Hi,
I am new to exjs4.1.Can anybody tell working flow of mvc in extjs4.1. from my understand .The first It will load app.js and then load the view .when the controller part will call and execute? can anybody tell what is controller ?.How it is executing? If i am wrong please help